tsparser: add support for call expressions

[fredr]

Add support for call expessions by parsing type annotations, not via body parsing

Add support for getting types like these:

export type Ret = {
  id: number;
  name: string;
  description: string;
};

function HelloWorld(a: string, b: number): Ret {
  return {
    id: 1,
    name: "Hello",
    description: "Hello description",
  };
}

export const X = HelloWorld("hello", 5);
export type Y = typeof X;

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